HULK:
I have until now not found any good description on how to send a sms with a Sony Ericsson here on Arduino.cc . Below i share my gathered knowledge and ask other to fill in if they have something to share.First of i would say that connecting a newer modell of a SonyEricsson phone direct to the TX/RX pins will not work. It seems as new Sony Ericsson phones need a TX/RX voltage of somewhere about 2,6V to get it working. If you use one of the listed older phones you should get it working with the 5V TX/RX from the Arduino.

To understand how to send a sms you need to check this link:http://www.dreamfabric.com/sms/

For easy conversion of septets into octets use below link, it will save you a lot of time:http://www.twit88.com/home/utility/sms-pdu-encode-decodeUse 00 for SMSC and then input your number in the receiver area.

Coding example is provided below, reason to why you need to wait 3 seconds between AT commands is that otherwise you will overflow the serial communication and the phone will ignore the commands.

More AT commands can be found here: http://developer.sonyericsson.com/cws/download/1/707/466/1277362028/DW-65054-dg_at_2006--10_r17a.pdf

Have fun :D

moustic:
hello,

I have a T250i and I would like to connect it to my arduino to send sms.The data cable I have is an usb one, coud you explain how I can connect them together ? I suppose I have to remove usb connector, but I don't know the pinout for the phone. Or is it possible to have a breakout connector somewhere ?

HULK:
Sorry, do not know the pinout of the T250i. I googled it and found below picture, if it is correct or not i can not say, you need to search for it on the internet. Yes, you need to remove the usb connector and connect the cables to Arduino.

moustic:
Hello, I ordered a cable and received DCU-60 one. pinout is like the picture. but I cannot make it to work with arduino

How can I test that the serial connection is well working ? i'm on a mac.

HULK:
I suggest that you try try to connect your phone to the computer by the usb and then use a hyper terminal. Try to type just "AT" , you should get a "OK" back. Remember to set the baud rate to 9600. If that works then you need to check your connections with the Arduino. Maybe switch around TX and RX.I assume that you have connected both the Arduino and the phone to the same grounding point otherwise it will not work.